What is each separate section of discant-style organum called?

The development of structural steel and the ________ were essential to the development of the modern skyscraper

A. electric elevator B. pre-cut glass panes C. ancient techniques of concrete D. cable car

Match the person or term with the appropriate description

1. southern soul A. Motown producers responsible for Supremes hits 2. head arrangement B. Producer for Atlantic records and Stax 3. soul ballad C. Owner and founder of Motown records 4. Holland-Dozier-Holland D. Stax and Fame 5. Jerry Wexler E. slow soul song with romantic lyrics 6. Berry Gordy F. melody line + chords of a song